To one alleged victim, he pretended he had told actress Julie Christie about her, while he told the parents of another woman that he played squash with Tommy Steele.

Several of the women claim they had taken calls from what they thought was Clifford pretending to be Hollywood celebrities, including actor Charles Bronson; Dynasty director Aaron Spelling and James Bond producer Albert "Cubby" Broccoli.

One woman, who was 19 at the time, claims when she was at his office Clifford exposed himself and told her: "Look at my penis. Isn't it tiny? What can I do with this?"

She was one of several women, who did not know each other, who told police that Clifford made reference to his “tiny penis”, the jury were told.

He allegedly asked another woman: “Is this the smallest one you have ever seen?”

His youngest victim was said to be 12 years old when she was abused in 1983, but she does not form part of the criminal allegations against him as she says he forced her to masturbate him in a pool in Spain - which is outside the jurisdiction of the British courts.

Clifford denies 11 counts of indecent assault between 1966 and 1984.

Ms Cottage told Southwark Crown Court in London: "This case concerns sexual assaults upon children and young people over a 20-year period. The defendant used his contact with famous people to bully and manipulate these young people into sexual acts with him.

"In his actions, we say he breached the trust of parents he had encouraged to trust him and young women working for him or seeking jobs in the world in which he worked."

Clifford, wearing a grey blazer with a white shirt and dark trousers, listened to proceedings from the glass-walled dock using a hearing loop and shook his head as some of the allegations were outlined.

Describing him as the “maker of the kiss-and-tell celebrity and the breaker of reputations”, Ms Cottage said: "He has been at the top of the media game for many years. He knows the strings to pull. He knows how to manipulate, lie and get what he wants.

"He is a man who likes to play games with people and you will hear evidence of the games that he played with these girls and young women.

"As the years went by, he got away with his behaviour, he must have thought he was untouchable and no doubt thought no one would complain and, if they did, they would not be believed."

Several alleged assaults took place in Clifford's central London offices, the court heard, which one woman said was "sexually orientated", with the PR guru constantly playing games with female models and making calls to them, pretending to be Michael Winner.

"He would put on a different voice and invite them into the office for a meeting telling them not to wear any knickers," Ms Cottage said.

The publicist has denied knowing any of the women, but has said that if he had met them, nothing they described would have happened.

He has admitted having sexual encounters with "many women", the court heard, but claimed they were all consensual.

The women began to come forward as the allegations over Jimmy Savile hit the headlines and the publicist appeared on ITV's Daybreak breakfast programme to discuss the scandal, the court heard.

When he was arrested an anonymous letter sent by one of the woman was found in his bedside table at his home in Hersham.

The court heard extracts of the letter, which said: "You abused me, you hurt me, upset me and you are a vile, horrible man."

It went on: "It has taken me 35 years to write this letter so hopefully it will reach you."

As the letter outlined the alleged abuse the woman claimed to have suffered at the hands of Clifford, it referred to how he had won over her parents, and added: "You took pleasure in degrading me", asking: "How many others like me are there out there?"

Explaining why the complainants had not reported the alleged assaults at the time, the prosecutor told the court: "The 1960s, the 1970s and the '80s were very different times from today.

"There was no social media. Secretaries had to bite their lips when the boss patted their bottom and told them to 'run along, love, and make me a cup of tea'.

"A complaint would have earned them ridicule and the sack.

"Nineteen sixty-five was the year the miniskirt was first sold by Mary Quant and the year that Ian Brady and Myra Hindley were arrested and charged, so it's a long time ago," she added.

The prosecutor told the court that, although in the 1970s the Equal Pay Act and Sexual Discrimination Act came into force, there was still a strong pressure "not to complain".